Statement :

The model in which the requirements are implemented by its category is to be identified.

Step 1: Understand the Statement

The key phrase in the question is:

“Requirements are implemented by its category”

This means:

• Requirements are divided into different categories
• Each category is implemented separately
• The system grows step by step with each implementation

Step 2: Analyze the Given Models

Waterfall Model

All requirements are implemented together in a linear sequence. This does NOT support category-wise implementation.

Prototyping Model

Used mainly to clarify requirements through prototypes, not to implement requirements category by category.

Evolutionary Development Model

Focuses on continuous evolution of the system, but does not explicitly emphasize category-wise implementation.

Iterative Enhancement Model

In this model:

• Requirements are classified into categories
• Each category is implemented in an iteration
• System functionality is enhanced step by step

Step 3: Final Decision

The model that exactly matches the statement “requirements are implemented by its category” is:

Iterative Enhancement Model

The correct answer is: Iterative Enhancement Model